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Secretory granules produced by the Mehlis' gland and by the wall of the distal ootype in Schistosoma japonicum females were periodate reactive, stained intensely with a phosphotungstic acid-HCl mixture at pH 0.9, and showed no presence of sulphydryl, carboxyl and sulphate groups. These results as well as the sensitivity of the granules to the proteolytic action of papain indicated that the secretions produced by the Mehlis' gland and by the ootype wall were neutral glycoproteins.